1,324 research outputs found
Aspect ratio dependence of heat transport by turbulent Rayleigh-B\'{e}nard convection in rectangular cells
We report high-precision measurements of the Nusselt number as a
function of the Rayleigh number in water-filled rectangular
Rayleigh-B\'{e}nard convection cells. The horizontal length and width
of the cells are 50.0 cm and 15.0 cm, respectively, and the heights ,
25.0, 12.5, 6.9, 3.5, and 2.4 cm, corresponding to the aspect ratios
, , ,
, , and . The measurements were carried out
over the Rayleigh number range and the
Prandtl number range . Our results show that for
rectangular geometry turbulent heat transport is independent of the cells'
aspect ratios and hence is insensitive to the nature and structures of the
large-scale mean flows of the system. This is slightly different from the
observations in cylindrical cells where is found to be in general a
decreasing function of , at least for and larger. Such a
difference is probably a manifestation of the finite plate conductivity effect.
Corrections for the influence of the finite conductivity of the top and bottom
plates are made to obtain the estimates of for plates with
perfect conductivity. The local scaling exponents of are calculated and found to increase from 0.243 at
to 0.327 at .Comment: 15 pages, 7 figures, Accepted by Journal of Fluid Mechanic
Tetrakis(1-phenyl-1H-imidazole-κN 3)bis(thiocyanato-κN)nickel(II)
The title compound, [Ni(NCS)2(C9H8N2)4], crystallizes with two independent half-molecules in the asymmetric unit and the NiII ions situated on centres of symmetry. In both independent molecules, the NiII ion displays a compressed octahedral environment formed by four N atoms from the 1-phenyl-1H-imidazole ligands, which define the equatorial plane, with a mean Ni—N distance of 2.119 (11) Å, and two axial N atoms from two NCS− anions, with a mean Ni—N distance of 2.079 (7) Å. The crystal packing exhibits weak intermolecular S⋯S contacts of 3.411 (2) Å
Impact of Sucrose Addition on the Physiochemical Properties and Volatile Compounds of “Shuangyou” Red Wines
“Shuangyou,” a Vitis amurensis Rupr. variety, is widely cultivated in northeastern and western China. Its berries have high acidity and low sugar content. In this study, different proportions of sucrose were added to the must samples during fermentation to investigate the effect of sugar on the physicochemical properties and volatile compounds of “Shuangyou” wines. The addition of sucrose significantly improved yeast growth and alcohol production, altered the color qualities, and slightly decreased titratable acidity during fermentation. The highest tested proportion of added sucrose resulted in the highest maximum yeast counts and final ethanol concentrations. Moreover, 37 volatile compounds (esters, alcohols, fatty acids, ketones, and aldehydes) were identified and quantified by solid-phase microextraction with gas chromatography-mass spectrometry. The concentrations of these compounds were correlated with the addition of sucrose. Furthermore, the addition of 100 g/L sucrose was sufficient for improving the concentrations of the aromatic compounds. The increase in ester, alcohol, and fatty acid concentration led to a positive OAVs impact (odor activity value > 1) at the end of fermentation
TRACE: 5D Temporal Regression of Avatars with Dynamic Cameras in 3D Environments
Although the estimation of 3D human pose and shape (HPS) is rapidly
progressing, current methods still cannot reliably estimate moving humans in
global coordinates, which is critical for many applications. This is
particularly challenging when the camera is also moving, entangling human and
camera motion. To address these issues, we adopt a novel 5D representation
(space, time, and identity) that enables end-to-end reasoning about people in
scenes. Our method, called TRACE, introduces several novel architectural
components. Most importantly, it uses two new "maps" to reason about the 3D
trajectory of people over time in camera, and world, coordinates. An additional
memory unit enables persistent tracking of people even during long occlusions.
TRACE is the first one-stage method to jointly recover and track 3D humans in
global coordinates from dynamic cameras. By training it end-to-end, and using
full image information, TRACE achieves state-of-the-art performance on tracking
and HPS benchmarks. The code and dataset are released for research purposes.Comment: Project page: https://www.yusun.work/TRACE/TRACE.htm
Theoretical analysis for the apparent discrepancy between pbarp and pp data in charged particle forward-backward multiplicity correlations
The strength of charged particle forward-backward multiplicity correlation in
pbar+p and p+p collisions at s^1/2 = 200 GeV is studied by PYTHIA 6.4 and
compared to the UA5 and STAR data correspondingly. It is turned out that a
factor of 3-4 apparent discrepancy between UA5 and STAR data can be attributed
to the differences in detector acceptances and observing bin interval in both
experiments. A mixed event method is introduced and used to calculate the
statistical correlation strength and the dynamical correlation strengths
stemming from the charge conservation, four- momentum conservation, and decay,
respectively. It seems that the statistical correlation is much larger than
dynamical one and the charge conservation, four-momentum conservation and decay
may account for most part of the dynamical correlation. In addition, we have
also calculated the correlation strength by fitting the charged particle
multiplicity distribution from PYTHIA to the Negative Binomial Distribution and
found that the result agrees well with the correlation strength calculated by
mixed events.Comment: 5 pages, 4 figure
Improving the Message-ciphertext Rate of Lewko\u27s Fully Secure IBE Scheme
In Eurocrypt 2012, Lewko presented a fully secure IBE scheme in the
prime order setting based on the decisional linear assumption. We note that
some random factor involved in the ciphertext can further be used to hide yet another message
, and get a new fully secure IBE scheme with better message-ciphertext rate.
Similar to Lewko\u27s
scheme, we use dual pairing vector space in prime order bilinear
groups to simulate the canceling and parameter hiding properties of
composite order settings. The security of our scheme is based on the
subspace assumption, which can be reduced to the decisional linear
assumption. We employ the dual system encryption technique in our
security proof
Apresiasi Masyarakat Terhadap Tradisi Lisan Permainan Rakyat Jaran Kepang Di Kanagarian Simalidu Kecamatan Koto Salak Kabupaten Dharmasraya
The perposes of this researeh are to describe and the explain the appreciation of society in kanagarian Simalidu Kecamatan Koto Salak Kabupaten Dharmasraya. West Sumatra to the Jaran Kepang. The research is using the descriptive methade and the of this research is qualitative the issues that describe is type the appreciation and the acceptance of the society to Jaran Kepang in Kanagarian Simalidu Kecamatan Koto Salak Kabupaten Dharmasraya. That obtainable through the questionnaire and interview that using by the instrument in this research. The accumulation technique of data that using here are: (1) the observation to searching the informan that requires in the research, (2) give the questionnaire that contain same questions that have to be answered by the society in Kanagarian Simalidu Kecamatan Koto Salak Kabupaten Dharmasraya, (3) The structural interview, by using some questions to the informans based an the research, (4) record, by recorded oral data that express by the informans, (5) note, by kating all the informan that has bean obtained from the observation the interview, and the recard
浅析中药学与民族药学对木香的临床应用异同
Costusroot is commonly used in traditional medicine,Mongolian medicine,Tibetan medicine,Dai medicine and Uighur medicine. We discuss similarities and differences in clinical applications of costusroot in traditional medicine,Mongolian medicine,Tibetan medicine,Dai medicine and Uighur medicine, from aspects of its property and flavor,functions and indications ,and clinical applications. For sake of retaining their own features, the authors intended to integrate the essences of the two, broaden its clinical applications, make costusroot to play its role fully and fully understand the natural medicinal plants ,which is more conducive to modernize the traditional medicine.木香是中、蒙、藏、傣以及维医药学的常用药。本文从木香的性味、功效主治及临床应用等方面,比较探讨木香在中医药学、蒙医药学、藏医药学、傣医药学及维医药学中的临床应用异同,希冀在保留各自特色的基础上,相互借鉴,拓宽临床应用,使之发挥其更全面的作用,同时全面认识自然界药用植物,更有利于促进中药现代化
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